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Alternator Pulley / Pulley Nuts
By OE Match
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 928 4.5L 1978-82
Pulley half specifications: 8 holes / Diameter - 96 mm
Replacement pulley half designed for the front engine V-belt drive system of early Porsche 911/912 and Porsche 914 models. This pulley sits on the generator/fan hub, providing one half of the V-belt sheave assembly that drives the alternator/fan unit via the ribbed or flat belt. Manufactured to match Porsche’s original spec.
Fits:
Porsche 911 1965 - 1974
Porsche 911 1975 - 1977 Engines 911/41/42/46/47/83
Porsche 914-6 1970 - 1976
Diagram ref no 11
• Position on Vehicle: Fan/generator drive assembly – pulley half mounted on alternator/fan hub, forming part of the V-belt drive.
• Function: Provides the correct sheave geometry for the V-belt that drives the alternator/generator and cooling fan; ensures proper belt tension, belt contact interface and belt stability under engine load.
• Applications: Ideal when the original pulley half shows signs of corrosion, rust, flange damage, belt mis-tracking, belt wear or vibration due to pulley run-out.
While seemingly small, the alternator/fan drive pulley plays a vital role in engine accessory drive functionality. A worn, corroded or mis-aligned pulley can lead to:
• Belt slippage or chatter under load
• Excessive belt wear or fraying
• Vibration, noise or resonance in the belt drive
• Reduced alternator or cooling system efficiency
Replacing this pulley half restores correct belt path and geometry, eliminates abnormal drive noise/vibration and helps preserve the longevity of the belt and driven accessories.
When to replace:
• Visible corrosion, rust or 'bite-marks' on the pulley surface
• Belt bounce or vibration at idle or under load
• Belt skipping or fraying on one edge
• You’re performing a drive-belt service or replacing the fan/generator assembly in a classic Porsche
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90160342101
The product you are viewing cross references to these numbers
OEMatch Alternator Pulley / Pulley Nuts — Fit, Function, Confidence
OEMatch alternator pulleys and pulley nuts for Porsche models support the alternator drive by transferring torque from the engine belt to the alternator shaft. Correctly matched pulleys and secure nuts reduce belt slip, damp vibration and help maintain stable charging and accessory power under varied driving conditions.
Available Types
- One-way decoupler pulley
- Fixed solid pulley
- Pulley nut with locking washer
Understanding OEMatch Alternator Pulley / Pulley Nuts
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original alternator pulleys and pulley nuts. OE (Original Equipment) refers to parts matching original specifications for the alternator pulleys and pulley nuts and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM alternator pulleys and pulley nuts engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
These components sit on the alternator shaft and interface with the serpentine or accessory belt, using bearings or decoupler mechanisms to maintain smooth rotation. Common symptoms of wear include belt squeal, visible wobble, reduced charging output and illumination of the battery or charging warning lights. OEMatch catalogs over 4,000 individual part numbers and over 8,700 OE cross-references and continues developing new lines to keep Porsche vehicles on the road.
Benefits Include
- Consistent charging and electrical reliability
- Reduced belt wear, noise and vibration
- Improved rotational balance and component life
Why Alternator Pulley / Pulley Nuts Wear and Fail
- Bearing fatigue or internal corrosion leading to rough rotation
- Seizure or failure of one-way decoupler mechanisms
- Belt misalignment or over-tensioning accelerating wear
- Contamination from oil, dirt or road debris affecting balance
The Importance of Replacing with OEMatch Alternator Pulley / Pulley Nuts
Replacing worn pulleys and pulley nuts avoids belt failure and potential alternator damage, restoring stable charging and preventing accessory faults. Timely renewal during belt or alternator service preserves drive alignment and reduces the risk of secondary failures. OEMatch parts are drawn from original specifications where applicable and are offered to support correct fitment on Porsche models.
Advantages
- Direct-fit replacements engineered to match original dimensions and tolerances
- Fits original mounting points and clearances for straightforward installation
- Compatible with factory systems and sensors where applicable
Support & Advice
These items affect safety-critical systems. Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified. If the vehicle includes hidden sensors or you are unsure of the procedure, seek professional help and verify correct alignment and fixing points during installation.
